Analyzing of segregation in mixtures of 3-methylpyridine and heavy water by dynamic neutron radiography (II)

In 3-methylpyridine-heavy water mixture, the segregation in the closed-loop phase diagram in relation to the temperature and heavy water concentration was studied by dynamic neutron radiography (DNR) at the 10 MW VVR-SM Research Reactor in Budapest, Hungary. On the pixel properties of the DNR images, taken from the phase separation process by Iman 2β v. image analyzing program, polynomial fitting, 3-D intensity histograms were applied. For modeling the segregation process, a two-variable segregation model: S=f(T,D) was set up. From the partial differentiation of the function f with respect to the temperature it was established that the highest rate changes in the segregation take place in the region of 50-55°C and are modified by 3-methylpyridine concentration. The increase in the segregation process progresses up to 93-96°C, then declines.